黄骅坳陷南堡凹陷古近系沙一段页岩油储层特征及油气意义

南堡凹陷古近系沙一段页岩油藏为黄骅坳陷南堡凹陷未来勘探的重点领域。利用岩心及薄片观察、扫描电镜、核磁共振、X射线衍射等多种分析测试手段，研究了南堡凹陷沙一段页岩储层的岩石学特征、储集空间类型及孔隙结构特征。研究结果表明：①研究区页岩发育灰暗相间水平纹层长英质页岩、深灰色块状混合质页岩、灰色粒序纹层混合质页岩、黑灰色水平纹层混合质页岩等4种岩相，页岩油主要储集在深灰色块状混合质页岩、灰色粒序纹层混合质页岩、黑灰色水平纹层混合质页岩中。②黑灰色水平纹层混合质页岩的裂缝最为发育，孔隙度最大；灰色粒序纹层混合质页岩比深灰色块状混合质页岩孔隙度大，但深灰色块状混合质页岩比灰色粒序纹层混合质页岩裂缝发育；储集空间包括裂缝、残余粒间孔、矿物晶间孔及溶蚀孔，孔喉特征主要为大孔微细喉，孔隙半径为125.369～156.048 μm，平均为133.209 μm，喉道半径为0.377～0.860 μm，平均为0.622 μm。③南堡凹陷沙一段混合质页岩厚度大、含油性好、裂缝发育、储集性能好，具有良好的页岩油形成条件，具有较大的页岩油勘探潜力。

Shale oil reservoir characteristics and significance of the first member of Paleogene Shahejie Formation in Nanpu Sag，Huanghua Depression

The shale oil reservoir of the first member of Paleogene Shahejie Formation（Es1）is the focus of future exploration in the Nanpu Sag of Huanghua Depression. The petrological characteristics，reservoir space types and pore structure characteristics of shale reservoir of Es1 in Nanpu Sag were studied by means of core and thin section observation，scanning electron microscope，nuclear magnetic resonance and X-ray diffraction. The results show that： （1）Four lithofacies are developed in the shale of this area，including gray and dark alternating horizontal laminar felsic shale，dark gray massive mixed shale，gray graded laminated mixed shale，black gray horizontal laminar mixed shale. Shale oil is mainly stored in dark gray massive mixed shale，gray graded laminated mixed shale，black gray horizontal laminar mixed shale.（2）The black gray horizontal laminar mixed shale has the most developed fractures and the largest porosity，and the gray graded laminated mixed shale has higher porosity and less fractures than the dark gray massive mixed shale. The reservoir space includes fractures，residual intergranular pores，mineral intercrystalline pores and dissolved pores. The pore throat is characterized by large pores and tiny throats，the pore radius ranges from 125.369 μm to 156.048 μm with an average of 133.209 μm，and the throat radius ranges from 0.377 μm to 0.860 μm，with an average of 0.622 μm.（3）The mixed shale of Es1 in Nanpu Sag has a large thickness，good oil-bearing properties，developed fractures and good reservoir performance. It has good shale oil formation conditions and great shale oil exploration potential.